851601932861 has 4 divisors (see below), whose sum is σ = 851604852924. Its totient is φ = 851599012800.

The previous prime is 851601932851. The next prime is 851601932873. The reversal of 851601932861 is 168239106158.

851601932861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 485599922500 + 366002010361 = 696850^2 + 604981^2 .

It is a cyclic number.

It is not a de Polignac number, because 851601932861 - 2³⁴ = 834422063677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851601932851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 967100 + ... + 1624341.

It is an arithmetic number, because the mean of its divisors is an integer number (212901213231).

Almost surely, 2^851601932861 is an apocalyptic number.

It is an amenable number.

851601932861 is a deficient number, since it is larger than the sum of its proper divisors (2920063).

851601932861 is a wasteful number, since it uses less digits than its factorization.

851601932861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920062.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 851601932861 in words is "eight hundred fifty-one billion, six hundred one million, nine hundred thirty-two thousand, eight hundred sixty-one".